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You can list it in your profile as well as at the bottom of all your posts. Go to My Account at the top of the page, then to Settings, and then to Public Profile's About Me text box. You can type in whatever info you want there (a bit about yourself, fave authors and genres, etc). You can also go to Forum Settings and add a statement like "My books come from a smoker's home" or such. This will add the statement to the bottom of your posts (where my pictures are).
Altho, unless the person looks at your profile, they won't know it. It's up to the requestor to use the Requestor Conditions if they prefer not to have books that come from a smoking household. There's no way for you to ensure that they look at your profile, nor any reason for you to feel responsible to let them know, if they don't have RCs.
If they don't want smokey books, they will say so. If they don't say so, it's their fault for not using the method that PBS provides for them to be selective in the books that they receive. It doesn't hurt to put it there, but if someone complains, don't bother pointing out that you have it in your profile, point out to them that it is their responsibility to use RCs.
Oh! And welcome to PBS, I hope you have lots of fun and become totally addicted like the rest of us!!! :)